chore: replace caas-team with telekom due to repo transfer

[lvlcn-t]

Motivation

Due to the repository transfer from our caas-team orga to the telekom orga, we had several issues with our CI.

This resulted in:

• Image wasn't pushed to the right container registry
• E2E tests didn't run properly
• Prune Workflow failed every day on midnight because of missing orga registry.

Changes

I've replaced every occurence of the word 'caas-team' with 'telekom'. Now everything should work properly again.

I also changed the go module name on pupose. The sparrow is not a library so we don't need to take care about import backwards compatibility.

For additional information look at the commits.

Tests done

The CI works again:

Image Registry: https://github.com/telekom/sparrow/pkgs/container/sparrow
Charts Registry: https://github.com/telekom/sparrow/pkgs/container/charts%2Fsparrow

• Unit tests succeeded
• E2E tests succeeded

TODO

• I've assigned this PR to myself
• I've labeled this PR correctly
• Manually move old images & charts to the new telekom org registries.

[y-eight]

LGTM. moving latest 2 minor/major images each (appl & helm) should be fine.